挖孔桩基础挖孔时,孔内应经常检查有害气体浓度,当二氧化碳浓度超过0.3%、其他有害气体超过允许浓度或()时,均应设置通风设备。
2023-05-11
A.孔深超过5m
B.孔深超过8m
C.孔深超过10m
D.孔深超过15m
参考答案:C
B.孔深超过8m
C.孔深超过10m
D.孔深超过15m
参考答案:C
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2023-05-11
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